I’m baffled as to why they would break Tweetdeck like this. The cynical view is that Twitter want to break Tweetdeck so that people return to using the Twitter website directly, but that doesn’t entirely make sense. Tweetdeck provides abilities that Twitter just does not, like the ability to see tweets streamed in real time instead of periodic updates, and can show replies, messages and lists all at the same time alongside the timeline. If I were twitter I would brand Tweetdeck as Twitter Pro and call it a premium service. Instead they seem to be deliberately making it like the Twitter website and breaking it. Unfortunately there is still nothing better to move to.